Is there really a need for long johns in the summer? unless you are using something like a trouser that is something like the fortius 1.0 fabric from arc'teryx or you're ice climbing i really don't think you need them, but since you asked, I would probably go for Arc'teryx's AR baselayer (SL is just far to fragile for use as long underwear) if i had the money to burn, from what I've heard and seen of Patagonia's it's a bit on the loose side.

Folks vary a lot in cold tolerance. Alpine starts at elevation in, say, the Tetons can easily have temps in the mid-forties; if you are on the West side of the peak it is likely to stay chilly for a good part of the day, the rock will be cold when you sit on it, and if it is windy the situation can be quite bracing. Personally, I've found powerstretch tights under softshell pants to be very comfortable in low fifties temps with high winds, but I've backed off a touch and use Patagonia lightweight capilene now. I agree that it is cut a little on the loose side (or maybe my legs are just too damn skinny). I also don't find them to be terribly uncomfortable when the temps rise; I'm far more sensitive to excessive insulation on my torso.

+1 for smartwool. Not that Icebreaker or Patagonia isn't good. But I happen to have a pair of Smartwool NTS long johns (250 weight). I've had them for about 8 years now, and they held up amazingly well. The wool is soft and not itchy at all, and they have been washed on hot (by accident) a few times, and have been dried hot, with cotton shirts ( again, by accident) a few times, with no noticeable shrinking and very minimal piling. Worth the price for sure! And if you can afford to wait, stuff does go on sale occasionally...

I've used 3-4 different brands of base layers and found them all to work well and be comfortable. The one factor you have to have is Merino wool. They are comfy, warm and resist stinking. Synthetic will start stinking bad, especially on a big mountain after several days of wearing. I also don't think they breathe or work as well.

I've also been looking at the smartwool heavy mountaineering socks. These run on average $23 a pair.

I won't be doing any treks over 6 miles and most distance is on glacier travel.

For climbing i'll be doing class IV scrambling so the extra padding would be nice. People swear by these socks though but i'm not sure they will be necessary. My boots are also slightly insulated down to -7 degrees C so I'm trying to find a good balance on temperature.

Anything merino for a baselayer. Huge fan of my Icebreaker. As for socks, I'm a huge fan of Darn Tough. You pay for them ($25 bucks a pair) but they will replace them, no questions asked, if they sustain any sort of damage.

I like the regular-weight stuff (I run warm) but they also make an extra-warm version. The inventory seems pretty slim right now, but I expect it will fill out in the fall when they start selling winter clothes (full range of long/short sleeve and v/crew/turtle-necks).

I prefer it to my capilene stuff...and I pay about $5 per piece on average during frequent sales. They have beige v-necks for $3.90 right now (regular $15)...I originally bought some v-necks for wearing with dress shirts in the city, but I honestly can't really tell the difference when I wear them outside...it isn't until I go with something more turtle-neck like that I can feel a difference.

I have several pairs of smartwool socks, light, medium, and heavyweight for the different seasons. They are great and extremely durable, the medium weight pairs I use for backpacking outlasted my hiking boots and have stood up to hundreds of miles of abuse. I don't think you will regret spending $23 on a pair of socks that will last you several seasons of hiking and mountaineering.

i use the HH {helly hanson} for skiing not sure where thats at price wise among others but its what i use and it keeps me warm down to single digits i use there "warm" pants but they offer other types for warmer temps.

I have several pairs of smartwool socks, light, medium, and heavyweight for the different seasons. They are great and extremely durable, the medium weight pairs I use for backpacking outlasted my hiking boots and have stood up to hundreds of miles of abuse. I don't think you will regret spending $23 on a pair of socks that will last you several seasons of hiking and mountaineering.

+1 for this Smartwool Socks. I bought some on sale 6 years ago and they are going strong. I think I have 2 each of each: heavy, medium, light.